Malicious PDF — malware analysis report

Static analysis result for SHA-256 b127cf0fba6e42e1…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 18:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e01127595941b59d5694e65ad2dfe1a SHA-1: eb468fc7eaa31c5825495fc2ffe5bd701aa98695 SHA-256: b127cf0fba6e42e1cc9a05879cf9e999cc5248a1bee6b00ba5c2edd87d9c89a4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=kindergarten+sight+words+practice+worksheets', which is likely used to funnel users to further malicious content. The document body, though partially corrupted, contains references to the same URL, reinforcing its malicious intent. The presence of multiple Shopify links, while some are benign, contributes to a link farm strategy to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=kindergarten+sight+words+practice+worksheets
    • http://files.bardicform.com/uploads/1/3/1/3/131383486/29924b.pdf
    • http://files.wagnersmarket.com/uploads/1/3/2/3/132303019/79dbace2681.pdf
    • http://xopena.lift4life.com/uploads/1/3/1/6/131637419/badiwetuto_pufizivam_jiverodavisewe_guvinawuvotideg.pdf
    • http://files.rockebassoon.com/uploads/1/3/0/7/130776875/jamusipela-zubufozomapiseg-riwepol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/91191720558.pdf
    • https://cdn.shopify.com/s/files/1/0437/1624/7703/files/dusabejububipalowobuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4242/files/mutulasumuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/rusisemuva.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/luzubopefimesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2484/9815/files/biography_example_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/17251836258.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/chuyn_hnh_t_sang_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/jovipatuxinexod.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/42439185865.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edb.bin
7ae6cbec8d6f65de3f18033a07505e8baa7cacfc0a9b8ce57cfdd4f8ed0959ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDB 5216 bytes
font_01_sfnt_off00007092.bin
3e73ef13c2ed48ceca590ebf1d430bed11e7b8f0582745eca8cfd69c290298d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7092 10204 bytes
font_02_sfnt_off00009368.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9368 4324 bytes

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